* {
    margin: 0;
    padding: 0;
}

.site-nav {
    background: none repeat scroll 0 0 #f5f5f5;
    border-bottom: 1px solid #eee;
    width: 100%;
    z-index: 10000;
}

.site-nav-bd-1 {
    float: left;
    margin-left: 70px;
}

.site-nav-bd-r {
    float: right;
    text-align: right;
    margin-right: 70px;
}

.menu-hd a {
    color: #6c6c6c;
    float: left;
    font-size: 12px;
}

ul {
    white-space: nowrap; /* �������֓Q�� */
}

ul li {
    position: relative; /* ʹ���x������ĸ�x�ε�����@ʾ */
}

/* �O��ĸ�x�ε��B�Y��ʽ */
ul li a {
    text-decoration: none;
    color: #777;
    padding: 8px 8px;
    display: block;
    background: url(detail.png) bottom right no-repeat;
}

/* ��ĸ�x���]�����x�Εr��Ҳ�����fֻ��һ���B�Y�r���[��detail.png */
ul li a:only-child {
    background: none;
}

ul .drop_menu:hover {
    background: #fff;
}

ul .no_drop_menu:hover > a {
    color: red;
}

ul .drop_menu .drop_menu_child:hover {
    background: none repeat scroll 0 0 #f5f5f5;
}

ul li:hover > ul {
    display: block; /* ������ĸ�x���ᣬ�@ʾ���x�� */
}

div > ul > li {
    display: inline-block; /* ʹһ���x���ų�һ�M�� */
}

/* �����x���@ʾ�һ���x�ε����·� */
ul ul {
    position: absolute;
    top: 100%;
    list-style: none;
    background: #fff;
    box-shadow: 0 2px 2px rgba(0, 0, 0, 0.2);
    display: none;
}